The nurse identifies which of the following diagnostic laboratory tests as the one the nurse should assess first to establish a diagnosis for renal disease? A. Blood urea nitrogen (BUN) B. Serum creatinine C. Serum uric acid D. Serum potassium

To establish a diagnosis for renal disease, the nurse should assess the diagnostic laboratory test that is most indicative of renal function. The first step is to understand the purpose and significance of each test option provided.

A. Blood urea nitrogen (BUN): BUN is a measure of the amount of nitrogen in the blood that comes from the waste product urea. Elevated BUN levels can indicate impaired kidney function, but it is not specific to renal disease.

B. Serum creatinine: Creatinine is a waste product produced by muscle metabolism and is filtered out of the blood by the kidneys. Elevated serum creatinine levels are a more specific indicator of impaired kidney function and are commonly used to assess renal disease.

C. Serum uric acid: Uric acid is a waste product that is produced when the body breaks down purines, which are found in certain foods and are also produced by the body. Elevated levels of serum uric acid can be associated with conditions such as gout, but it is not a primary indicator of renal disease.

D. Serum potassium: Potassium is an electrolyte that plays a crucial role in various bodily functions, including maintaining proper kidney function. However, elevated serum potassium levels are not specific to renal disease and can be seen in other conditions as well.

Based on the information provided, the nurse should assess the serum creatinine level first to establish a diagnosis for renal disease. Elevated levels of serum creatinine are a more specific indicator of impaired kidney function and are commonly used in the diagnosis and monitoring of renal disease.